Another metric to watch out for is expansion ratio - or the change in volume of adjacent cells. In my opinion I would try to keep the expansion ratio less than 20%

Finally the skewness angle is another important metric to watch. This measures essentially the orthogonality of the adjacent faces of a single cell. This metric is repersented differently depending on the mesher or solver calculating the value so you will need to consult the documentation for the software. Essentially you want two faces of a cell to be orthogonal (the angle between faces should be around 90 degrees) but this is typically very difficult to achieve for all cells in a mesh and the angle between adjacent faces can easily fall to much lower values. Try to keep the minimum skewness angle between faces larger than about 15 deg. Again take note of how the mesher /solver calculates skewness and if in doubt contact a rep for that software for more clarification.

Hope this helps and happy meshing!! It's always the hardest part of performing a CFD calculation and will give you many grey hairs over your career!!!